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Planer for MEK 4450Marine operasjonerKværner ASA, June 2011

Lift phases

Load outTransportationOver boarding

Removal of sea fasteningLift upLifting routeStart lowering

Splash-zoneSlammingWave impacts

LoweringSofter system,- resonance

LandingPositioning

Deck layout

Deck layout

Deck area

Deck strength

Lifting route

Sea fastening

Limiting weather criteria (transit, WoW)

Low complexity

Easy, swift and cost effective installation

Swift removal. Minimized need for hotwork during removal

Lifting from deck of vessel

Lifting from deck of vessel

Lifting from deck of vessel

Lifting from deck of vessel

Well defined route of lift. Static capacity of crane (DAF=1.3?)

Clearance to ships side

Restraining load from unwanted motions

Test lift for all complex routings!

Vessel ballasting. Vessel roll reduction not to be used.

Slewing before luffing.

Sufficent analysis performed?

Splash zone

Splash zone

Often dimensioning for crane force

Vessel listed towards lifted object

Bouyancy reduces mass of objectBallasting of vesselCrane wire tension

Sufficient time for air to evacuate

No use of AHC

Stability of lifted objectInternal tanksAir filled compartment

Further lowering

Is the total duration understood?Fatigue issues on the loadEffects on the crane and wire

Load rotation control

Increased weight of the wire.

Generally no use of AHCDeep water resonance

Deep water effects

Gjennomgang lekse

Landing

Position control vs tolerancesPosition, Heading and Inclination

Landing speedDamage moduleSoil damage (stiff clay)

Reduction of tension in crane wireVessel movement and ballasting

Capacity of AHC

Disconnection of rigging

Recovery

Recovery

Rigging connection points

Suction effects from seabed

Water escapation

Crane capacity

Load control and means of load motion restraints

Sufficient deck space

Disconnect rigging

Seafastening